Preheat oven to 350 ℉.
Season beef chuck roast generously with salt and pepper on all sides.
Heat olive oil in a large Dutch oven pot over medium high heat.
When oil is hot add roast to the pot and sear until browned, about 4-5 minutes per side .
Add sliced onions and sliced pepperoncini peppers to the pot.
In a small bowl, combine beef broth, Italian dressing mix, Italian seasoning, and pepperoncini juice. Pour over beef roast in the pot.
Place lid on the pot and transfer to preheated oven.
Cook for 3-4 hours (about 1 hour per pound of beef).
Once beef is fork tender, remove pot from the oven.
Use tongs or two forks to shred the beef and stir in sliced red bell pepper strips.
Cover the pot with the lid and return it to the oven.
Cook for an additional 30-45 minutes or until red peppers soften.
Remove pot from the oven and let beef rest for 10 minutes before serving.
While beef rests, toast hoagie rolls and melt Provolone cheese onto each roll.
Serve beef on toasted hoagie rolls with melted Provolone cheese and some of the pan drippings on the side for dunking your sandwich.